• The Journal of Korean Institute of Communications and Information Sciences
• /
• 제41권3호
• /
• pp.338-346
• /
• 2016

Wearable Device has various constraint about battery power consumption, size, weight, etc, because the devices is worn and operated by person and provide services. So, if a device includes too many functions, it dose not satisfies the constraint and lose price competitiveness due to become expensive. Therefore we suggest that make reassembly Unit Modular Device witch has common used functions in wearable devices and user can receive various services to reassemble Unit Modules. It is comprised of frames and modules. Each module has various functions. Each frames help module to communicate each modules. To realize this device, we design to guarantee each services to use necessary modules, to give priority to modules depending on the important of the task, to set that does not use to low energy mode.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
• /
• pp.163-166
• /
• 2002

We investigated structural and electrical properties of Metal-Oxide-Semiconductor(MOS) structure using Hafnium $oxide(HfO_{2})$ as high-k gate dielectric material. $HfO_{2}$ films are ultrathin gate dielectric material witch have a thickness less than 2.0nm， so it is spotlighted to be substituted $SiO_{2}$ as gate dielectric material. In this paper We have grown $HfO_{2}$ films with pt electrode on P-type Silicon substrate by RF magnetron sputtering system using $HfO_{2}$ target and oserved the property of semiconductor-oxide interface. Using pt electrode, it is necessary to be annealed at ${300^{\circ}C}$. This process is to increase an adhesion ratio between $HfO_{2}$ films with pt electrode. In film deposition process, the deposition time of $HfO_{2}$ films is an important parameter. Structura1 properties are invetigated by AES depth profile, and electrical properties by Capacitance-Voltage characteristic. Interface trap density are measured to observe the interface between $HfO_{2}$ with Si using High-frequency(1MHz) C-V and Quasi - static C-V characteristic.

• Journal of Plant Biology
• /
• 제3권1호
• /
• pp.32-38
• /
• 1960

Since the peculiar virus disease of chinese date tree (Zizyphus jujuba Mill. var. inermis Rehd.) has been noted in South Korea around 1950, 70% to 80% of the economically important trees have been either completely destroyed or infected with the virus, severe damage has been noted, particularly, across the area ranged from middle east to the middle part of Korea, including Seoul area. Yoon-Koock-Byung in 1958 first reported the disease and descirbed it might be caused by a kinds of yellows. But he did not conform in his paper that the disease is pecisely caused by yellows virus. The authors, hereby intend to identify the true cause of the desease of the chinese data tree by studying the external symptoms of the disease and the internal morphological characteristics of the diseaset plant which shows various abnormalities in contrast to the healthy checks. In view of fact that leaves of the infected plants become yellowish in color similar to the peach yellows, aster yellows, it is likely to be identifiable as the common yellows. Furthermore, the abnormal characteristics observed by the authors are as follow: The floral organs such as petals, sepals, stamens, and pistil turn into vegetative leaves, the leaves on heavily infected plant appear as small sized one and also showing as a common witch's broom like symptom. There are also an occuring of numerous advantitious shoots developed from both of stems and roots. The amount of photosynthetic starch grains increases in parenchymatous cells, necrosis takes place in mesophyll, Particularly, Palisade Parenchyma in the leaves of infected plants are distinguished in contrast to the healthy checks. From the symptoms and the present experimetns described above, the authors are believed that the disease of chinese data tree is not caused by the yellows. It appears the disease is rather similar to the symptoms of sandal spike virus which was noted in India early in this centry. But the host plant of standal disease, Santalum albun L. and the insect vector, Jassus indicus Wal., have never been reported in Korean flora and the founa. The termperature and the otehr environmental factors is quite different Korea and India. Thus the authors believe that the peculiar disease must be an endemic new virus origin in Korea and must be called as "shoot cluster disease of chinese date tree."

• Journal of Korean Society of Forest Science
• /
• 제89권2호
• /
• pp.241-248
• /
• 2000

This research was conducted to investigate the physicochemical characteristics of stream water at the four points in the northeastern part of Puk'ansan National Park from July, 1998 to November, 1999. The average pH of stream water was 6.65 and dissolved oxygen was $10.7mg/{\ell}$, which indicated that the quality could be categorized in the first class for the quality of river water quality standard. In addition, the water was soft water and average percentage of dissolved oxygen was 96.7%, which was almost saturated. The number of visitors resulted in the increase of dissolved ion, witch affected on electrical conductivity of the water. The relationships between those factors was significant at the 1% level in linear regression. The electrical conductivity and the amount of anion($Cl^-$, $NO{_3}^-$, $SO{_4}^{2-}$)in downstream were higher than those in upstream.

• Journal of the Korean Society of Costume
• /
• 제51권7호
• /
• pp.147-165
• /
• 2001

The objective of this study was to develop the Jeogori Pattern for 9 to 10 year-old boys To determine the measurement items for the Jeogori Pattern making, applied factor analysis, correlation analysis and regression analysis to the 37 measurement items of the 9 to 10 year-old boys classified as a standard somatotype. To understand the shape and variation of the body surface, analyzed the replica of the upper body surface that was obtained by the method of using surgical tape. Be based on the results of the above studies, designed the Jeogori Pattern. The designed pattern was evaluated by the sensory test. The drafting methods of Jeogori Pattern obtained are as follows. $\circled1$ The measurement items are Bust Girth, Center Back Waist Length, Neck Width, and Hwajang Length. $\circled2$ Jeogori Length Center Back Waist Length$\times$4/3 $\circled3$ Front Body Girth(1/2) : B/2 + 1.5cm Back Body Girth(1/2) : B/2 + 3.5cm $\circled4$ Jin-Dong : B/4 + 3cm $\circled5$ Back Godae Width(1/2) : Neck Width/2 + 1.7cm Front Godae Width(l/2) : Back Godae Width(1/2) - 2cm $\circled6$Back Godae Point is 1.5cm higher than shoulder line, and Front Godae Point is 1.5cm lower than shoulder line. $\circled7$ Back Godae Depth: 1.2cm + 1.5cm = 2.7cm The Jeogori Pattern designed by the above method Is as (fig. 8) The results of the sensory test of the new pattern are as fellows. Except for 2 items, every mark of 24 test items has over 5.0 point and a total average mark is 5.25 point. Witch is a good mark. Therefore the new pattern is valid. Especially, the parts of Git, sleeves and back face have a high mark, so the appearances of those parts are excellent.

• Journal of the Korean Society of Costume
• /
• 제51권7호
• /
• pp.63-73
• /
• 2001

The purpose of this study was to be of use for more successful prediction of possible Prevailing aesthetic characteristics in the future, by reviewing how decadent features have actually been unfolded in fashion and make-up since the end of 20th century, as we are now in the new 21st century. The decadent traits of modern fashion and make-up since the late'90s could be listed as follows : first, the fashion has intentionally been designed to look disgusting, where realistic and imaginary images coexist, by using a half-man, half-machine image or vividly describing detestable animal skin, There have also been disgusting features in the make-up, which are so extremely weird that we can created by adding vinyl or pieces of textiles like Patch of the 17th century. Second, the satanic character of the fashion seems to be meant to keep in harmony with evil image such as Dracula, witch, skeleton or warrior of the evil, in order to charge the unnatural, inhuman and fin-de-siecle Phenomenon and find out what It really means for the inner world of men. And the demonic expressions of the make-up chiefly use white or black color or blue color of low saturation or low lightness, and part of facial features is exaggerated or shortchanged. Third, the decadent characteristics are expressed in the fashion by attaching sensational ornament to the human bode or using sexual exposure. So they give unnatural, unsound and extremely erotic impressions. The decadent features in the make-up are generated by excessively using a gay red color or sensational, exciting colors. Fourth, the exoticism of the fashion is largely affected by China's Chipaoh, Japan's Kimono or primitive motives from Africa, as there are increasing interests in Asia. And that of the make-up leans toward the East, as Kabuki make-up from Japan, Kyongkeuk make-up from China or the primitive features from Africa are employed.

• Journal of IKEEE
• /
• 제20권3호
• /
• pp.265-272
• /
• 2016

A SCALDO(Supercapacitor Assisted LDO) regulator is a newly studied regulator to improve the efficiency of a LDO regulator. Commonly a LDO regulator has very low efficiency and a SCALDO regulator can improve it considerably because this regulator can reuse meaninglessly wasted energy at the LDO regulator by a supercapacitor witch is attached between input and a LDO regulator. However this regulator has several challenges because it is a being studied regulator. One of them is an overvoltage issue. At initial operating of this regulator, a supercapacior is totally discharged and input is connected with a supercapacitor and a LDO regulator in series. Thus, input voltage is enabled to a LDO regulator and this input voltage is a significant value to a LDO regulator because commonly input voltage is bigger than twice output voltage. In this paper, to solve this overvoltage issue, we proposed a new SCALDO regulator that has a pre-charger for charging a supercapacitor before starting operation. And we found that a proposed SCALDO regulator can properly reduce overvoltage of a LDO regulator through experiments.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• 제15권1호
• /
• pp.51-58
• /
• 2001

Recently, DC-DC converters significantly increase the total losses as rising switching frequency. Trnditional soft switching technique for reducing switching losses even increase voltage/Clment stress of switch In this paper, Resonant circuit for soft switching is connected in parallel with power stage and only operates just before tum-on of the main sWItch. Therefore, ills doesn't affect the total circuit QI'||'&'||'pound;ration. The object of tIns paper is to make the linearized equivalent loss mxleIs. and to analyze the total losses by experiment. ZVT-PWlvI converter designed with 170-260[V] input, 400[V] 5[A] output, and 100[kHz] switching frequency is tested respectively with 500[W], 1[kW], 1.5[kW], and 2[kW] loads. The total losses in input 220[V], 2[kW] load are analyzed by usirm the linearized equivalent loss models.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• 제13권3호
• /
• pp.505-513
• /
• 2009

Z. Cao had proposed NFRM(new fuzzy reasoning method) which infers in detail using relation matrix. In spite of the small inference rules, it shows good performance than mamdani's fuzzy inference method. But the most of fuzzy systems are difficult to make fuzzy inference rules in the case of MIMO system. The past days, We had proposed the MIMO fuzzy inference which had extended a Z. Cao's fuzzy inference to handle MIMO system. But many times and effort needed to determine the relation matrix elements of MIMO fuzzy inference by heuristic and trial and error method in order to improve inference performances. In this paper, we propose a MIMO fuzzy inference method with the learning ability witch is used a gradient descent method in order to improve the performances. Through the computer simulation studies for the inverse kinematics problem of 2-axis robot, we show that proposed inference method using a gradient descent method has good performances.

• Journal of Broadcast Engineering
• /
• 제12권6호
• /
• pp.574-584
• /
• 2007

As the real time multimedia service become more popular, the needs of transmission with low delay and high quality are getting more stronger. Among those video compression technologies, the rate control method dose an important role in getting the effective data transmitting and the high image quality. In this paper, we combined the feature of CBR and VBR coding methods to propose a new bit-rate control method witch allows each frame to generates bits in the defined fluctuation range and applies a scene change detection at a part of frame and also can maintain low-delay and high quality even if the perfect VBR transmission environment is not guaranteed. The experiment result shows the proposed algorithm provides more effective method than TMN8 in real time application.